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Hagiwara Makoto

Faculty of Information Science and Technology　Systems Science and Informatics　System SynthesisProfessor

Researcher basic information

■ Degree
  • Doctor of Engineering, Tokyo Institute of Technology, Mar. 2006
■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
  • 20436710
J-Global ID■ Research Keywords and Fields
Research Keyword
  • Electric power system
  • Electrical machine
  • Power Electronics
  • パワーエレクトロニクス
Research Field
  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering), Power engineering

Career

■ Career
Career
  • Jul. 2025 - Present
    Hokkaido University, Graduate School of Information Science and Technology Division of Systems Science and Informatics, Professor
  • Oct. 2024 - Jun. 2025
    東京科学大学 工学院 電気電子系 准教授
  • Apr. 2016 - Sep. 2024
    東京工業大学 工学院 電気電子系 准教授
  • Apr. 2015 - Mar. 2016
    東京工業大学 大学院理工学研究科 准教授
  • Apr. 2006 - Mar. 2015
    東京工業大学 大学院理工学研究科 助教
  • 2004 - 2006
    日本学術振興会 特別研究員
Educational Background
  • Apr. 2003 - Mar. 2006, Tokyo Institute of Technology, Graduate school of engineering, Department of electrical engineering
  • Apr. 2001 - Mar. 2003, Tokyo Institute of Technology, 理工学, 電気電子工学, Japan
  • Apr. 1997 - Mar. 2001, 東京工業大学, 工学部・電気電子工学科

Research activity information

■ Awards
  • 2026, IEEE Fellow
  • 2025, 電気学会, 電気学会 産業応用部門 論文査読促進賞
  • 2024, 永守賞
  • 2023, TPEL AE Excellence Award
  • 2019, IEEE senior member
  • 2018, 東京工業大学 工学院創生的研究賞
  • 2016, IEEE IAS IPCC Third Prize Paper Award
  • 2014, Isao Takahashi Power Electronics Award
  • 2014, IEEE IAS IPCC Third Prize Paper Award
  • 2014, IEEE IAS IPCC First Prize Paper Award
  • 2013, IEEE IAS IPCC First Prize Paper Award
  • 2013, IEEE Transactions on Power Electronics' Outstanding Reviewers of 2013
  • 2012, IEEE IAS IPCC First Prize Paper Award
  • 2010, IPEC-Sapporo2010 Second Prize Paper Award
  • 2010, IPEC-Sapporo2010 Second Prize Paper Award
  • 2009, 電気学会全国大会優秀論文発表賞
    Japan
  • 2009, 電気学会産業応用部門優秀論文発表賞
    Japan
  • 2001, 電気学会学術奨励賞
    Japan
■ Papers
■ Other Activities and Achievements
■ Lectures, oral presentations, etc.
  • Control and Experimental Verification of Unidirectional 3-Phase AC/DC Power Converter Using Single-Delta Bridge-Cell Converter
    Atsuya Suzuki; Makoto Hagiwara
    2025 International Future Energy Electronics Conference
    19 Nov. 2025 - 21 Nov. 2025
  • Applying Phase-Shift to Isolated DC-DC Converter Using Multiple Cascaded Chopper Cells
    Lucas Morales Pablo; Makoto Hagiwara
    2025 International Future Energy Electronics Conference
    19 Nov. 2025 - 21 Nov. 2025, 50265296
  • Output Power Feedback Control for DC-DC Converter Utilizing Singular Auxiliary Chopper Circuit
    Nour AK Hamdan; Makoto Hagiwara
    2025 International Future Energy Electronics Conference
    19 Nov. 2025 - 21 Nov. 2025, 50265296
  • Study on multilevel power conversion technologies for electric drives
    2025 12TH INTERNATIONAL CONFERENCE ON POWER AND ENERGY SYSTEMS ENGINEERING (CPESE2025), 13 Sep. 2025, English, Invited oral presentation
    12 Sep. 2025 - 14 Sep. 2025, [Invited]
  • A Modular Multilevel PWM Inverter for Medium-Voltage Motor Drives
    IEEE Energy Conversion Congress and Exposition, 2009, Poster presentation
  • The Technical Possibilities of a Modular Multilevel PWM Inverter: A New Medium-Voltage Motor Drive for Energy Savings
    The 8th International Conference on Power Electronics and Drive Systems, 2009
  • A Modular Multilevel PWM Inverter for Medium-Voltage Motor Drives
    IEEE Energy Conversion Congress and Exposition, 2009, Poster presentation
  • The Technical Possibilities of a Modular Multilevel PWM Inverter: A New Medium-Voltage Motor Drive for Energy Savings
    The 8th International Conference on Power Electronics and Drive Systems, 2009
  • PWM Control and Experiment of Modular Multilevel Converters
    Proceedings of 2008 IEEE 39th Power Electronics Specialist Conference, 2008
  • Effects of phase-locked-loop circuit on a self-commutated BTB system under line faults
    IEEE Power Electronics Specialists Conference, 2008., 2008
  • PWM Control and Experiment of Modular Multilevel Converters
    Proceedings of 2008 IEEE 39th Power Electronics Specialist Conference, 2008
  • Effects of phase-locked-loop circuit on a self-commutated BTB system under line faults
    IEEE Power Electronics Specialists Conference, 2008., 2008
  • Magnetic Saturations of in Transformers used for a Self-Commutated BTB System with Ride-Through Capability of Voltage Sags
    Proceedings of 2006 IEEE 37th Power Electronics Specialist Conference, 2006
  • Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
    Proceedings of 2006 IEEE 41st Industrial Applications Society Annual Meeting, 2006
  • Magnetic Saturations of in Transformers used for a Self-Commutated BTB System with Ride-Through Capability of Voltage Sags
    Proceedings of 2006 IEEE 37th Power Electronics Specialist Conference, 2006
  • Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
    Proceedings of 2006 IEEE 41st Industrial Applications Society Annual Meeting, 2006
  • Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a Single-Line-to-Ground Fault Condition : Experimental Verifications by a 200-V, 20-kW Laboratory System
    2005
  • Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
    Proceedings of 2005 International Power Electronics Conference, 2005
  • 16段多重変換器を用いた自励式BTBシステムの一線地絡時における過渡特性 : 200V 20kWミニモデルを用いた実験的検討
    電気学会 半導体電力変換研究会, 2005
  • Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
    Proceedings of 2005 International Power Electronics Conference, 2005
  • A Multi-Level BTB System for Power Flow Control between Transmission Networks
    Proceedings of 2004 IEEE 39th Industrial Applications Society Annual Meeting, 2004
  • A Multi-Level BTB System for Power Flow Control between Transmission Networks
    Proceedings of 2004 IEEE 39th Industrial Applications Society Annual Meeting, 2004
  • An Approach to Regulating the DC-link Voltage in a Self-Commutated BTB Converter under Power System Faults
    Proceedings of 2003 IEEE 37th Industrial Applications Society Annual Meeting, 2003
  • An Approach to Regulating the DC-link Voltage in a Self-Commutated BTB Converter under Power System Faults
    Proceedings of 2003 IEEE 37th Industrial Applications Society Annual Meeting, 2003
  • Performance of a Self-Commutated BTB System under a Single-Line-to-Ground Fault Condition
    Proceedings of 2002 Power Conversion Conference, 2002
  • Performance of a Self-Commutated BTB System under a Single-Line-to-Ground Fault Condition
    Proceedings of 2002 Power Conversion Conference, 2002
■ Affiliated academic society
  • The Institute of Electrical Engineers of Japan
  • IEEE
  • 電気学会
■ Research Themes
  • 電池電力貯蔵システムへの適用を目的としたコンデンサ絶縁型直流-直流変換器の研究
    科学研究費助成事業
    01 Apr. 2025 - 31 Mar. 2028
    萩原 誠
    日本学術振興会, 基盤研究(B), 東京科学大学, 25K01211
  • 各種マルチレベル電力変換器による基幹系統用疑似慣性変換器に関する研究
    パワーアカデミー研究助成
    Feb. 2026 - Mar. 2028
    萩原 誠; 佐野 憲一朗; 柿ヶ野 浩明
    パワーアカデミー, 特別推進研究, 北海道大学; 東京科学大学; 立命館大学, Principal investigator, 2025-T01a
  • 電気自動車用超急速充電器への適用を目的とした絶縁型直流-直流変換器の研究
    科学研究費助成事業
    01 Apr. 2022 - 31 Mar. 2025
    萩原 誠
    日本学術振興会, 基盤研究(B), 東京工業大学, 22H01463
  • High-power dc-dc converter for electric vehicles and electric aircraft
    Grants-in-Aid for Scientific Research
    01 Apr. 2019 - 31 Mar. 2022
    Hagiwara Makoto
    This research outcome is expected to be applied to mobile bodies such as electric vehicles and electric aircrafts in the near future with a power rating of 100 kW. Attention is paid to large-capacity power electronics technology and a dc-dc converter that can realize small size, light weight, and low loss is proposed. The validity of the dc-dc converter is verified experimentally using a downscaled model and computer simulation using PSCAD, for contributing to the expansion of electrical vehicles and aircrafts, the improvement of the global environment, and the realization of a energy-saving society. It has been confirmed that the proposed dc-dc converter can achieve good steady and transient performance while achieving high efficiency and high power density.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Tokyo Institute of Technology, 19H02125
  • 移動体への適用を目的とした高電力密度・高効率化を同時に実現可能な革新的直流変換器の研究開発
    産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) トライアウト トライアウトタイプ(標準)
    2021 - 2021
    萩原 誠
    本課題は、移動体へ適用される半導体電力変換技術に着目し、申請者が提案した高電力密度・大容量化を実現可能な直流変換器の高効率化手法(実現する技術)を検討する。上記変換器は複数の単位電力変換器から構成し、同一のスイッチング周波数で駆動する点に特徴があるが、損失増大により高効率化が困難という問題が存在した。本課題では各単位変換器の周波数を個別設定することで、実現可能性判断に必要な目標値である最高効率99%実現を目指す。目標値の実現可能性は、実験検証とシミュレーションにより明らかにする。本課題を解決することで、高電力密度・高効率化を同時に実現でき、輸送業界に対するイノベーションインパクトは極めて大きい。
    科学技術振興機構, 東京工業大学, Principal investigator
  • Study of next-generation wind turbine generation systems based on multilevel converters
    Grants-in-Aid for Scientific Research
    01 Apr. 2014 - 31 Mar. 2017
    Hagiwara Makoto
    The generator voltage of a cutting-edge wind turbine generation system (WTGS) is expected to increase from the conventional low-voltage level of 690 V to a medium-voltage level of 6.6 kV with a power level up to 10 MW without the
    application of a parallel connection of multiple power units. This research project proposed a 10-MW WTGS consisting of a three-phase open-winding synchronous generator equipped with six lead terminals and three modular multilevel converters (MMCs) which are identical in terms of circuit configuration. The validity of the system has been confirmed by computer simulation using PSCAD software package along with experiment using a down-scaled system. Moreover, this research projects has proposed a new non-isolated dc-dc converter which can achieve reduction in size and weight of an inductor. The validity of the new dc-dc converter has been confirmed by a 150 V down-scaled system and computer simulation using PSCAD software package.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Tokyo Institute of Technology, 26420223
  • Study of innovative high-power ac motor drive systems
    Grants-in-Aid for Scientific Research
    01 Apr. 2013 - 31 Mar. 2017
    Akagi Hirofumi
    The aim of this research is to establish a core technology of high-efficiency and high-performance medium-voltage motor drives for large-capacity fans and compressors. From a practical point of view, this research takes up a modular multilevel DSCC inverter used for such motor drives. When the research was initiateted in 2013, no detailed discussions have been made on the driving and braking performance of synchronous and induction motors.
    This research has designed, constructed, and tested a 400-V, 20-kW three-phase DSCC inverter consisting of eight cascaded chopper cells per arm. Experimental waveforms of the DSCC-based motor drives show satisfactory performance in adjustable-speed drives of the three-phase permanent magnet six-pole synchronous motor rated at 360 V，75Hz，and 15 kW, as well as the three-phase four-pole induction motor rated at 380 V, 50 Hz, and 15 kW. Other experimental waveforms of the induction-motor drive provides fast and safe dynamic-braking performance.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Tokyo Institute of Technology, 25249029
  • Study on a motor drive using a modular multilevel converter
    Grants-in-Aid for Scientific Research
    2011 - 2012
    HAGIWARA Makoto
    This study has dealt with a modular multilevel converter (MMC) that is considered as one of the next-generation multilevel converters with a focus on its applications to medium-voltage motor drives. The study has shown that the MMC can operate without using any dc-link capacitors connected between the common dc terminals. Moreover, it has proposed a control method to achieve stable operation at low speed without inducing any overvoltage and/or overcurrent. Moreover, a stable startup from the standstill to the nominal speed has been achieved by applying the common-mode voltage injection method developed in this study. The validity of the motor drive has been confirmed by experiment using a 400-V, 15-kW downscaled model.
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Tokyo Institute of Technology, 23760255
  • Study of an Innovative Energy Storage SystemUsing New Secondary Battery Modules
    Grants-in-Aid for Scientific Research
    2009 - 2012
    AKAGI Hirofumi; HAGIWARA Makoto; FUJITA Hideaki
    The aim of this research is to establish the core technology of the next-generation environment-friendly battery energy storage system that is characterized by combing the latest Li-ion battery modules with a modular multilevel cascade converter. The three-phase experimental system rated at 200 V, 10 kW, and 20 kWh was designed, constructed, and tested to confirm and justify the operating principles and stable performance of the battery energy storage system. As a result, a total harmonic distortion (THD) value of the line (supply) current complies completely with the Japanese harmonic guidelines. In addition, stable ride-through capability of the so-called “voltage sag” was confirmed by computer simulation under various voltage sag conditions.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Tokyo Institute of Technology, 21246045
  • Experimental verification of a three-phase modular multilevel converter
    Grants-in-Aid for Scientific Research
    2009 - 2010
    HAGIWARA Makoto
    This research has dealt with a three-phase modular multilevel converter that is considered as one of the next-generation multilevel converter. This research has focused on its application to a medium-voltage motor drive with fans or blowers, in which the load torque is proportional to the square of the rotating speed. Also, this research has attempted to control negative-sequence reactive power by using a STATCOM based on the MMC. The validity of the motor drive and the STATCOM has been confirmed by experiment.
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Tokyo Institute of Technology, 21760213
  • Study on the dynamic behavior of the self-commutated BTB system when different PLL circuits are applied
    Grants-in-Aid for Scientific Research
    2007 - 2008
    HAGIWARA Makoto
    各種PLLシステムが自励式BTBのグリッド変圧器・変換器用変圧器の直流偏磁現象, および電源電流・直流コンデンサ電圧変動に与える影響について, PSCADを用いたシミュレーションより検討を行った。その結果, dq変換をベースにした三相PLL回路が自励式BTBに最も適していることを定量的に明らかにした。
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Tokyo Institute of Technology, 19760193
  • Research on a Transformerless Hybrid Filter Capable of Direct Connection to Medium-Voltage Distribution Systems
    Grants-in-Aid for Scientific Research
    2006 - 2007
    AKAGI Hirofumi; FUJITA Hideaki; HAGIWARA Makoto
    The aim of this research is to develop a hybrid active-passive filter capable of direct connection to medium-voltage utility and industrial power systems without transformers. This hybrid filter is intended for harmonic current compensation of a medium-voltage adjustable-speed motor drive for energy savings in pumps and blowers. Such a motor drive requires no regenerative braking, thus allowing the motor drive to use a three-diode rectifier as the front end. This research leads to the following findings:
    1. The investigators have done feasibility study and conceptual design of a 6.6-kV transformerless hybrid filter suitable for a motor drive with a three-phase diode rectifier. This hybrid filter is characterized by series connection of a three-phase passive filter tuned In the seventh-harmonic frequency with a three-phase small-rated active filter using a three-level diode-clamped PWM converter without transformer.
    2. The investigators have achieved theoretical analysis of harmonic current mitigation by the hybrid filter, with focus on the required volt-ampere ratings of the passive filter and the active filter Their ratings have a tradeoff in terms of harmonic current mitigation. Computer simulation has been carried out, considering the effects of control delay and the so-called "dead time." The theoretical analysis has been compared with the computer simulation. As a result, the validity of the theoretical analysis has been confirmed, and a limitation of the analysis has been revealed.
    3. Taking into account the above-mentioned theoretical analysis and computer simulation, the investigators have deigned, constructed and tested a three-phase 400-V 15-kW downscaled system, where a three-level diode-clamped PWM converter has been used for the active filter. What is a major concern in introducing the three-level PWM converter into the hybrid filter is to keep the dc mean voltages of the two split dc capacitors balanced not only in steady states but also in transient states. The investigators have proposed a voltage-balancing control method for the hybrid filter The effectiveness and viability of the method has been verified by the experiments using the 400-V 15-kW system. The current THD (total harmonic distortion) in the supply side was less than 5%, and each harmonic current component was less than 3%, including up to 40-th harmonic components. Both the THD value and harmonic components perfectly meet the Japanese harmonic guidelines.
    4. Considerations on the 6.6-kV transformerless hybrid filter that will be put into practical use in the near future have been discussed on the basis of the results from the theoretical analysis, computer simulation and experiment.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Tokyo Institute of Technology, 18360132
  • 自励式BTB(Back-To-Back)に関する研究
    科学研究費助成事業
    2004 - 2005
    萩原 誠
    自励式BTB(Back-To-Back)システムは,有効電力と無効電力の独立制御が達成できる,一線地絡等の系統事故時にも運転継続が可能である等優れた特長を有する電力変換器であり,次世代型電力伝送システムとして国内外問わず研究が行われている。研究代表者は100MWクラスの大容量電力変換器への適用を目的とした,16段多重変換器を用いた自励式BTBシステムの制御法や回路構成の提案を行い,研究室で設計・製作した200V,20kW試作システムを用いて実験的な検証を行っている。
    研究代表者は,BTBシステムの正常動作時における動特性について試作システムを用いた検証を行い,十分な電源高調波成分の低減が実現できることを実証した。また,一線地絡時の運転継続に必要不可欠な3msという高速な電流制御が実現できることを示した。本研究成果は,電気学会論文誌産業応用部門誌2005年4月号にて掲載されている。
    研究代表者は,次に一線地絡時における自励式BTBシステムの過渡特性について検討を行った。瞬時交流電圧ベクトルによる電源電圧の振幅・位相情報を用いると同時に,ディジタル制御系で発生する一サンプル遅延を補償する逆相電圧補償法を提案し,事故時の逆相電圧・逆相電流の抑制効果を確認している。更に,直流電圧変動や変圧器の磁気飽和現象に関する検討を行った。本研究成果は,電気学会論文誌産業応用部門誌2006年3月号にて掲載される予定である。
    日本学術振興会, 特別研究員奨励費, 東京工業大学, 04J50341